聚合物分离膜表面仿生共沉积改性及其性能研究  

Modification of Microporous Polymer Membranes via Surface Co-deposition and the Separation Performances

作　　者：安坦 于辉 徐丽君 徐志康[1] 万灵书 Tan An;Hui Yu;Li-jun Xu;Zhi-kang Xu;Ling-shu Wan(MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027)

机构地区：[1]教育部高分子合成与功能构造重点实验室浙江大学高分子科学与工程学系

出　　处：《高分子学报》2019年第12期1298-1304,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金面上项目(基金号51873192);优秀青年科学基金(基金号51522305);中央高校基本科研业务费专项资金(基金号2015XZZX004-26)资助

摘　　要：发展了一种基于单酚化合物阿魏酸和铜离子的新型表面沉积体系,通过液相共沉积方法在不同基底表面构建了共沉积涂层.考察了组分比例和沉积时间等因素对沉积行为的影响.在最佳沉积条件下制备了涂层改性聚丙烯微孔膜,通过扫描电子显微镜、衰减全反射傅里叶变换红外光谱仪、X射线光电子能谱仪、固体表面zeta电位分析仪和水接触角测试仪等对膜表面进行了表征,并将其应用于油水分离和染料吸附.结果表明,改性膜表面具有良好的亲水性以及强烈的荷负电性,对水包油乳液具有优异的分离性能以及良好的渗透通量;同时,改性膜对荷正电染料具备优良的吸附能力.研究结果有望丰富单酚类化合物的沉积行为研究,发展新型表面沉积体系.Surface deposition systems such as dopamine and tannic acid have received great attention in recent years and have been widely applied in surface modification of polymer separation membranes. It is generally accepted that only polyphenols containing catechol structure can effectively form surface coatings. This paper reports a novel surface co-deposition systems based on ferulic acid and Cu2+. It should be noted that ferulic acid, a monophenol, contains only one phenolic hydroxyl group, without acatechol structure. Co-deposition coatings were prepared on various substrates, and the effects of composition and deposition time were investigated. Results indicate that the ferulic acid/Cu2+ system is able to form coating layer on most substrates. However, the coatings cannot be effectively formed on highly hydrophilic susbtrates such as silica, glass, and quartz. Microporous polypropylene membrane with surface coatings was prepared under optimal deposition conditions, and the surface structure and properties were characterized by field emission scanning electron microscopy(FE-SEM), attenuated total reflection Fourier transform infrared spectroscopy(ATR-FTIR), X-ray photoelectron spectroscopy(XPS),zeta potential analyzer, and water contact angle measurement. The modified membranes were applied to the separation of oil-in-water emulsions and dye adsorption. The results show that the modified membrane becomes hydrophilic and strongly negatively charged, while the surface porous structure changes little. The modified membranes can be used for the separation of various oil-in-water emulsions with high separation efficiency. It is also demonstrated that the membranes can be used repeatedly in the separation of emulsions. Furthermore, the coatings endow the membranes with strongly negatively charged surfaces, and hence the modified membranes show great potential in the adsorption of positively charged dyes. The results may introduce a novel monophenolbased system for surface deposition and greatly expand the types of surface

关 键 词：表面沉积 阿魏酸 聚丙烯微孔膜 油水分离 染料吸附 

分 类 号：TQ051.893[化学工程]